Sometime a term "distributed ledger technology" (DLT) is used to designate the blockchain technology: The DLT term was introduced by regulators, when they started blockchain, distinguish from an ambiguous reputation of the Bitcoin's blockchain. There are authors researching and testing who even distinguish DLT and blockchain, particularly because "blockchain" they the term use define PoW consensus protocols only. The majority of academic and business fields do not see difference in DLT and blockchain, and as the author of this article distinguishes the reputation of blockchain and reputation of those using it, this article will utilize only the term "blockchain". At the end, what matters is the technology, its principles and use cases, but not how it is called.